In order not to introduce a new I/O concept to the common Linux code,
Linux/390 preserves the IRQ concept and semantically maps the ESA/390
subchannels to Linux as IRQs. This allows Linux/390 to support up to 64k
-different IRQs, uniquely representig a single device each.
+different IRQs, uniquely representing a single device each.
Up to kernel 2.4, Linux/390 used to provide interfaces via the IRQ (subchannel).
For internal use of the common I/O layer, these are still there. However,
of those devices is uniquely defined by a so called subchannel by the ESA/390
channel subsystem. While the subchannel numbers are system generated, each
subchannel also takes a user defined attribute, the so called device number.
-Both subchannel number and device number can not exceed 65535. During driverfs
+Both subchannel number and device number cannot exceed 65535. During driverfs
initialisation, the information about control unit type and device types that
imply specific I/O commands (channel command words - CCWs) in order to operate
the device are gathered. Device drivers can retrieve this set of hardware
The function is meant to be called with an irq handler in place; that is,
at earliest during set_online() processing.
-While the request is procesed synchronously, the device interrupt
+While the request is processed synchronously, the device interrupt
handler is called for final ending status. In case of error situations the
interrupt handler may recover appropriately. The device irq handler can
recognize the corresponding interrupts by the interruption parameter be
-0x00524443.The ccw_device must not be locked prior to calling read_dev_chars().
+0x00524443. The ccw_device must not be locked prior to calling read_dev_chars().
The function may be called enabled or disabled.
CCW_FLAG_DC - data chaining
CCW_FLAG_CC - command chaining
-CCW_FLAG_SLI - suppress incorrct length
+CCW_FLAG_SLI - suppress incorrect length
CCW_FLAG_SKIP - skip
CCW_FLAG_PCI - PCI
CCW_FLAG_IDA - indirect addressing
The device driver is allowed to issue the next ccw_device_start() call from
within its interrupt handler already. It is not required to schedule a
-bottom-half, unless an non deterministicly long running error recovery procedure
+bottom-half, unless an non deterministically long running error recovery procedure
or similar needs to be scheduled. During I/O processing the Linux/390 generic
I/O device driver support has already obtained the IRQ lock, i.e. the handler
must not try to obtain it again when calling ccw_device_start() or we end in a